fix: [postgres] prevent possible edge case depending on content of stdin !minor

If stdin was "-e" for instance, this would have been interpreted.

odoo-tecnativa/actions/load

@@ -155,7 +155,7 @@ check_input() {
         exit 1
     fi
     {
-        echo -n "$chars"
+        printf "%s" "$chars"
         cat
     }
 }